Alfa exhaust manifold stud
Posted: Mon Jul 27, 2015 9:25 am
Hi folks!
My "other car" is an Alfa Spider, for which the cast exhaust manifold is currently on my bench. Problem is that one of the four manifold to down pipe flange studs has sheared off.The smooth section between the two threaded ends of the stud is proud of the flange, but threaded section has broken off. I seem to have three options:
- tried heat but my blowlamp just isn't up to the job so will ask a local garage today to give it a go with hotter flame.
-If that fails then drill out the stud and re-tap. The stud is M8 and tables say that the pilot drill should be 6.8mm (17/64 inch in old money). Question is - could I get away with a 1/4 inch pilot drill - only 1/64 in it.
Final option, buy a new manifold - available but at a price.
Cheers
Martin B
My "other car" is an Alfa Spider, for which the cast exhaust manifold is currently on my bench. Problem is that one of the four manifold to down pipe flange studs has sheared off.The smooth section between the two threaded ends of the stud is proud of the flange, but threaded section has broken off. I seem to have three options:
- tried heat but my blowlamp just isn't up to the job so will ask a local garage today to give it a go with hotter flame.
-If that fails then drill out the stud and re-tap. The stud is M8 and tables say that the pilot drill should be 6.8mm (17/64 inch in old money). Question is - could I get away with a 1/4 inch pilot drill - only 1/64 in it.
Final option, buy a new manifold - available but at a price.
Cheers
Martin B